Electric heater.



A. H. HARVIB in W.IG. DAVIS.

ELECTRIC HEATER. APPLICATION FILED SEPT. s, 1910.

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ELECTRIC EBATEB.

APPLIGATON FILED SEPT. 3, 1910.

Patented M128, 1911.

2 SHEETS-SHEET 2.

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' 20 near its upper and lower'end whereby fluids UNITED STATES PATENT oEEioE.

4.AR'JHUR H. HAVIE AND WILLIAM G. DAAVIS, OF DALLAS, TEXAS, ASSIGNORS TO HARVIE-DAVIS HEATER COMPANY, OF PHOENIX, ARIZONA TERRITORY, A CORPO- RATION QF `ARIZON4 TERRITORY. l

` ELECTRIC HEATER.

Specification of Letters Patent.

Patented Feb. v738, 1911.

Tp all "wwmiit may concern;

Bev 1t known that we', ARTHUR H.' HAnvrE and WILLIAM G. )Davis2 .citizens of the United States,V residing at Dallas, in the .county of Dallas and State of Texas, have invented certain new andL useful Improve.l

. ments in Electric Heaters, of which the following is a specification.

,'within a suitable structure whereby theek-f sleeve and rise therein as heated.

' ment-is protected and insulated from exterior fluids or body.

A. further object resides in the provision -of a Wall or sleeve surrounding the structure which incloses the 'heating element so as to provide -a comparatively narrow Space therebetween, the sleeve having openings will be caused to enter the lower end of the Also provision is made whereby a- Huid entering the sleeve' comparatively cold `will be heated as 4it rises in the sleeve and ejected from the openings at the upper end of the sleeve, a

v circulation of the fluid in which the heater ,i is immersed thus being had.

Finally the object of the invention is to provide means of .the character described that w11] be strong, durable, .elicient, and

A easy ofnoperation, simple and comparatively inexpensive to construct, and also in which the-several parts will not be likely to get cnt ,of working order. l

Without limiting the invention cx'cept 'withinthe scope of the' claims appended hereto, we have, in

skilled in the art to build a heater embodyl order to enable those is a horizontal cross sectional view on the line B-B of Figli, Fi 8. is a vertical scctional View of still 4a): t er form with a portion in elevation, 9. is a horizontal cross sectional view on the line YY vof Fig. 8,

form embodying a vplastic structure sur'- `rounded by a metal sleeve, Fig. 11. is a vertical section ofthe same, Fig. 12. is a horizontal cross sectional view 'on the line S-D of Fig. 10, Fig. 13. is a plan View of the sleeve shown in Figs. 10 and 11, Fig. 14. is a vertical sectional view of a form similar to that shown in Fig. ll and showing a particular form of electrical contacts and fastening, Fig. 15. is a plan view of the form shown in :Fig: 14 with the cap removed, Fig. 1Q). is a horizontal cross'sectional view on the line A-A of Fig. 14, and Fig. 17. is a' vertical. sectional view of another modification embodying a plastic structure.

In Figs. l to 5 of the drawings tbc nu- -Ineral l ydesignati-)s a plastic core or spool which is preferablvforlnerl of porcelain although it is to be understood that the core need not necessarily be formed of plastic material and any suitable insulating material may bc used. The spool is provided at each end with annular beads or flanges Q. A. suitable resistance wire 3 is wound about the spool and one end of 'the wire carried up through the center of thc spool so that both ends will teri'ninatc thercabove.

rlhe spool arid wire constituteY a heating element and it is obvious that the heating element may be made 'in various forms. vWhile the heating element is one of the necessary parts ol the invention, its particular construction and form maybe 'varied to such a degree as to leave the exact construction and forni to thc judgment ot' the builder and the, purpose for which the heater is to be used. fe have shown herein some of the many forms of heating elements which may be employed.

Referring to Figs. 1 to 4 inclusive it will he seen that [he spool or heating element is inserted in a tubular' casing or receptacle 4 having a bottom 5. Thc'vcasing terminates at its upper end in an outwardly directed flange 6. A gasket 7 is placed on the ange and in turn receives the flanged portion of `a cap 8 having an entrance 9 for electricalwires 10 which are suitably fastened to the cn'ds of the resistance Wire 3.

`Fig. 10. is a view in elevation of a modified is disposed about the casing 4 in concentric relation thereto. At the lower end of the sleeve, which terminates substantially lflush with the bottom 5 of the casing,' a plurality of openings 12 are formed. At its upper end the jacket has anV outwardly directed lian e111 between Whichand the underside of tie flange 6 a gasket 15 is interposed.' rl `he greatest diameters'ofthe flanges 6 andv 14, the 'gaskets 7 and 15 and the flanged portion of the capS are equal. and When assemdrawn c .tight joint.

i kinds of coffee percolators.

' esttempera'turc and is displaced by the fluid through the openings 12.

bled' as shown in Figs; 1 and Savill have their outer peripheries 'substantially flush, thus producing a neat appearance. parts just described are fastened together by .screws 1 6 having their lower ends engaging the flange 14 and permitting the parts to` be osely together and provide a waterflange 14 a plurality of These Just belowthe holes 17 are formed in the sleeve.

holes are lconsiderably smaller than'tl1e-open ings 12. It Will be noted that the internal diameter of the jacket is greater than the external diameter of the casing 4: and a narrow annular space or passage is provided' between the said parts.

When the heater is placed in the liquid and current passed over the resistance wire 3, heat will be radiated, the-jacket 4 and sleeve 11 will become extremely hot. That portion of the fluid 'which is standing in the passage between the casing and jacket, when heated and particularly to the point of boiling, will rise in the passage and 4escape through the openings 17. In fact the fluid will be ejected or sprayed through the open ings 17 with considerable force and the action is very similar to that had in certain It is obvious that as the water or'other fluid in the passage rises and escapes its place is taken by water or fluid from' the receptacle in which the heater is immersed, entrance being hail The fluid which enters the jacket through the openings l2 being taken from the lowest point has the losvejected through the openings 17 whereby a constant circulation is had which will cause the fluid to be expeditiously. heated.'

In Fig. 5 the flange 14 is omitted While the flange G of the easing fr has its outer pe# ripheryflush with the outer surface of the jacket 11. 'The outer periphery of the flange' Th e element is placed in' a 'casing 20 which has a rounded bottoni Q1. Int leeasing a lining 2910i mica or other insu ating material is disposed and holds the heating element vout` of contact with the casmgv [it 'its upper end the casing is screw threaded into a cap insulating material 25 'and 26 respectively are wound in alternate relation. vSuch an arrangenxent causes the individual coils of the resistance material to be insulated fromieach other. -Terminal wires ZT are connected to opposite ends of the resistance material. The heating element is disposed in a casing E28 Ahaving a shouldered collar 29 surrounding it's upper end. The collar is screw threaded into the depending flange 30 `of a cap 31 and is drawn against agasket '32dis osed in the cap. The collar below its shoult eredportionis gradually contracted tou-'ard itslouer end as indicated at -33 and receives the jacket 11 which is substantiallythe 'same form as is shown in Fig. 5 and is screwthreadedatits upper endinto the flange 30. The upper end of the jacket receives the.

portion-33 and a Water-tight joint i's provided when the jacketis drawn onthe collar 4by its screw threaded engagement in the flange'BO.

Figs-10 to 13 inclusive 'show a form in lll() which the hea'tingelementand the casinginclosing same are combined. ln .this .form a tubular member 34 composed of plastic ma terial such as porcelain is employed.' This` member has a bottom 35 and at its upper end Aa shouldered -portion 36 -and an outwardly directed flange 37. A suitable.resistancewire 38 is embedded in the-member being disposed in the formof a coil.l The porcelain completely surrounds a'nrl conceals the coiled portions of the wire thus insulating and protecting the same. The terminals of the wire are carried up through the center of the member and suitably connected-to electric wires supplying current- The 'member is surrounded by the jacket 11 .which lits-snugly about the shouldered portion 36 and is pro vided '-With outwardly `directed'ears 39 impinging the-underside of the flan e 37. The Vpassage between the jacket and .t emember together with the o enings 12 and. holes 1T v permits the'circulation of the fluid the same as in the .other form. Av asket or. washer -40 isplaced on the' flange 3 and'in turn re' ceives the flanged portion of a .porcelain cap 4;1.' Screws-4:2 assed through the cap,- the 'Washer 40,'the` an e 37 and the ears 39 fasten the; partsitget 4 er whereby a tight joint is formed..

A. s1ighuy modiaed farm is sa foral 'is their lower ends, each with an inwardly efrtending boss 4F.V Spring arms-46 secured 1n together.

I Figs. 14 to 16 inclusive. Substantially the.

same porcelain member and resistance wire 34 and 38 respectively are employed. Sub-1 stantially the same cap and washer 41 and portions of the clips extend intothe upper' end of' the member and are provided near the member have connection with the wire 38 extend upward and arebent outward so that the bosses 45 will engage the same as shown in Fig. 14 andhold the cap and member 34 The cap and member .may be i readily separated by merely pulling thesame apart.` The jacket 11 is in the form of a straight tube and is fastened about the member by a screw'47 threaded in .the jacket and engaging in a notch 48 of the portion 36 ofthe member. Y

Fig. 17 shows another porcelain form in which the member 34 has .instead of the flange 37 ar second shouldered portion 49 abmfethe shouldered portion .36. The portion 49 has a prgjection equal to the thickness of the jacket 11 and ts snugly into the flanged portion 50 .oa metal cap 51. The jacket has screw threaded en agement with -the portion 50 and bears against the shoulder 49.

It is obvious that anyof the several forms' of heater herein shown may be immersed in a vessel containing a 'fluid or food and the same heated or cooked as the case may be. Inv the cooking of foods it will-of course be a circulation of only the liquid portion. It i's to be understood that the circulation is not depended upon for the entire heating as a great amount of heat will radiate from the heater and the metal parts will remain exitremely-hot for some time after the current is turned off.

Then it is desired to completely submerge the heater a flexible hose 52 as shown in Fig. S may be engaged with the cap as shownin Fig. 8 -and the current supplying wires passed .through this hose. The hose should be long enough to extend above the level of the fluid in which the heater is submerged so as to prevent the fluid from entering the cap.V It inight be well tomentiontliat nin, every form the jacket andthe cap' areeither insulated vfrom orfhave no connection with the resistance wire or material vnor can/*the fluid which is being heatedfcome into contact with the resistancf" i ial and become charged with electricity.v as s thecase where the wire 'or resistance .materialis exposed to the fluid.-

vWhat we claim is:

' 1. In an electric fluid heater, a casing hav 1.

ing a sealed bottom, an electrical resistance material disposed in the casing out of con-A tact therewith, a' jacket greater in diameter than the casing surrounding the saine so that a vertical annular space is provided between thel jacket and casing, the jacket having openings near its vupper end and ,provided with larger openings at its lower end, the wall of the jacketbeing imperferate between the upper and lower openings, and a cap into which the jacket is inserted. 2. In an electric iluid heater, a casing having a sealed bottom, an electricalV resistance material disposed in the casing out of contact therewith, a cylindrical jacket greater in dia-meter than the casing surrounding the same so that a vertical-annular space is provided between the jacket vand casing, the lower end of the jacket being entirely open and unobstructed, the jacket also having openings near its upper end and provided with larger o enings at its lower end, the wallof the jac et-being'imperforate between the upper and lower openings, and a cap into which the jacket isnserted.

3. In an electric liuid heater, a casing having asealed bottom, anelectrical resistance material disposed in the casing out of contact therewith',h a cylindrical jacket, greater .in diameter than the casing, surrounding the same so that a Vertical annular space is provided between the jacket and easing, the lower end of thevjacket being entirely open and unobstructed, the jacket also having openings. near its upper end and provided with4 notches in its extreme lower end, the wall of the jacket being imperforate between the openings and the notches, and a cap .into which the jacket is inserted.

In testimony whereof we have signed our nam'es to this specification in the presence of ltwo subscribing witnesses.

L. E. Noack, Z. M. Dnonwolrrir.

`(iopies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents.

Washington, D, 0.1 

